A protester from Brighton was among 13 arrested after breaking into an air base during an anti-war demonstration.
The arrests came as 450 people protested at RAF Fairford, Gloucestershire, against war with Iraq.
Police said the majority carried out a peaceful protest but a "small minority" got in through the main gate.
A police spokesman said the protesters were quickly detained. He added: "A total of 13 people were arrested - ten men and three women."
The ages of those questioned ranged from 19 to 46 and they were from across the country, including West Yorkshire, London, south Wales and Brighton.
Nine were taken to Cirencester police station and four to Stroud police station for questioning.
Seven were arrested on suspicion of aggravated trespass, three of criminal damage, two of theft and one to prevent a breach of the peace.
Ten were released on police bail, to report back in March, pending further inquiries.
Two were cautioned and one was released without charge.
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